package com.ming.sps.server.utils;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;

public class MingUtil {
	private final static String DEFAULT_KEY = "MING579^";

	// 解密数据
	public static String decrypt(String message) {
		try {
			byte[] bytesrc = convertHexString(message);
			Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
			DESKeySpec desKeySpec = new DESKeySpec(DEFAULT_KEY.getBytes("UTF-8"));
			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
			SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
			IvParameterSpec iv = new IvParameterSpec(DEFAULT_KEY.getBytes("UTF-8"));
			cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
			byte[] retByte = cipher.doFinal(bytesrc);
			return java.net.URLDecoder.decode(new String(retByte), "utf-8");
		} catch (Exception e) {
			return "error";
		}
	}

	// 加密数据
	public static String encrypt(String message){
		try {
			Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
			DESKeySpec desKeySpec = new DESKeySpec(DEFAULT_KEY.getBytes("UTF-8"));
			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
			SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
			IvParameterSpec iv = new IvParameterSpec(DEFAULT_KEY.getBytes("UTF-8"));
			cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
			message = java.net.URLEncoder.encode(message, "utf-8");
			return toHexString(cipher.doFinal(message.getBytes("UTF-8"))).toUpperCase();
		} catch (Exception e) {
			e.printStackTrace();
			return "error";
		}
	}

	public static byte[] convertHexString(String ss) {
		byte digest[] = new byte[ss.length() / 2];
		for (int i = 0; i < digest.length; i++) {
			String byteString = ss.substring(2 * i, 2 * i + 2);
			int byteValue = Integer.parseInt(byteString, 16);
			digest[i] = (byte) byteValue;
		}
		return digest;
	}

	public static void main(String[] args) throws Exception {
		String value = "123456";
		System.out.println("加密数据:" + value);
		String a = encrypt(value);
		System.out.println("加密后的数据为:" + a);
		String b = decrypt("96702F2E1669B209");
		System.out.println("解密后的数据:" + b);
	}

	public static String toHexString(byte b[]) {
		StringBuffer hexString = new StringBuffer();
		for (int i = 0; i < b.length; i++) {
			String plainText = Integer.toHexString(0xff & b[i]);
			if (plainText.length() < 2)
				plainText = "0" + plainText;
			hexString.append(plainText);
		}
		return hexString.toString();
	}


}